Crusher.



PATENTED JULY 9. 1907. T. L. m. J. STURTEVANT.

GRUSHBR.

APPLIUATIOH I'ILED OGT. 4, 1906.

4 SHEETS-SHEET 1.

1n: mmms PETERS 5a., wnsmlvcvau, n cy I No. 859,348. PATE NTED JULY 91907.

. T. L. & T. L'STURTEVANT.

GRUSHBR.

EPPLIUATION PIIIED OCT. 4, 1906.

; 4 sums-sum '4.

"ms nomrts PETERS co., wAsmNanm, a. c. i

UNITED STATES PATEN OFFICE.

THOMAS LEGGETT STURTEVANT, OF QUINCY, AND THOMAS JOSEPH STURTEVANT, OFWELLESLEY, MASSACHUSETTS, ASSIGNORS TO STURTEVANT MILL COMPANY, OFPORTLAND, MAINE, A CORPORATION OF MAINE.

CIR/USHER.

Specification of Letters Patent.

Patented July 9, 1907.

Application filed October 4, 1906. Serial llo. 337.335.

To all whom it may concern:

Be it known that we, THOMAS Lnoen'rr STURIEVAN'I. and THOMAS JOSEPHSTURTEVANT, citizens of the United States, residing, respectively, atQuincy and Wellesley, in the county of Norfolk and State ofMassachusetts, have invented or discovered certain new and usefulImprovements in Crushers, of which the following is a specification,reference being had therein to the accompanying drawings.

This invention relates to a crusher of that class which comprises anoscillating or vibrating jaw co-operating with a fixed jaw in thereduction of the material; and the invention has for its object toprovide a crusher, of this class, more especially adapted for finecrushing, and which is of such a character as to combine durability withefiiciency of operation and convenience and simplicity of construction.

In the accompanying drawings, Figure 1 is a plan view of the improvedcrusher. Fig. 2 is a side view of the same with one of the side platesremoved, and with some of the parts in vertical section. Fig. 3 is adetail view of the operating lever showing the hearing roll mountedtherein, with the box-bearings for the shaft of said roll in section.Figs. 4 and 5 are side and end views, respectively, of the rearcross-beam of the machine which supports the bearings for the drivingshaft. Figs. 6, 7 and 8 are detail views of one of the box-bearings forthe bearing-roll. Figs. 9 and 10 are detail views of the bearing-rolland its operating cam or eccentric, illustrating slight modifications.

Referring to the drawings, the frame of the machine comprises theside-plates 12, a head block or front end cross-beam l3, bolted to saidside-plates, and a rear cross-beam 14 likewise bolted to said sideplates. In this class of crushers in which the side plates arepreferably of steel, and are comparatively thin or light, theside-plates of the frame have not been sufficiently stiff or wereinsufficiently braced at their rear parts on which the bearings of thedriving shafts carrying the cams or eccentrics for operating thecrushing jaws have been mounted; and owing to the severe strains whichcome on the driving shafts this construction has proved to be faulty inthat the rear portions of the frames would spring more or less underheavy strains, thus putting the shaft bearing out of alinement, so thatthe machines would soon wear out, or were comparatively short-lived forefficient operation. This objection isobviated in the present inventionin which the driving-shaft 15, carrying the operating cam or eccentric16 and the fly-wheels 17, is supported by the said rear cross-beam 14,said cross-beam having end portions 18 overhanging the said side-platesto whichiit is boltedlby means of flanges 19 preferably disposed betweenthe said side plates. The great strain on the driving shaft willtherefore come immediately ,upon said rear crossbeam, and not directlyon the side-plates; and the rear portion of the frame Will be greatlystiffened by this heavy cross-beam and its flanges which are stronglybolted to said side-plates.

The stationary crushing plate 20 is suitably fixed to the head block orfront cross-beam 13, affording a stationary jaw, and the movablecrushing plate 21 is carried by the lever 22 pivoted at its lower partto the side-plates 12 and affording a movable jaw; the said lever 22being actuated from the operating lever 23 carrying a roller 24 bearingagainst the cam or eccentric 16; the movements of said lever 23 beingimparted to the crushing lever 22 through a thrust-plate or toggle 25interposed between said levers which are provided with bearing bars orblocks 26 for the said thrust plate or toggle.

It will be observed that the bearing of the thrustplate or toggle on theoperating lever 23 is comparatively near the fulcrum of said lever, andthat the bearing for the said thrust-plate or toggle on the crushinglever 22 is near the free end of said crushing lever; and from this itresults that the vibrating movements of the said crushing lever arecomparatively slight or short, causing but littlewear, but are verypowerful and, as has been demonstrated, this construction is moreeflicient for fine crushing than the constructiens heretofore employedin which the crushing levers were pivoted or fulcrumed near their tops.In other words, in the improved machine, by pivoting the vibratingcrushing lever near its bottom and operating it in the manner describedthe machine is much better adapted for fine crushing than other similarmachines heretofore in use; while this construction is more desirablethan the old constructions in that it affords a more convenient accessfrom above to the crushing plates and other parts.

The crushing lever is retracted and the bearing roll 24 held in contactwith its operating cam or eccentric 16 through the medium of a spring 27interposed between a block 28, abutting against the rear crossbean1 14,and a collar 29 on a rod 30, and which rod is, in turn, secured to a bar31, so as to form an extension thereof, the said bar being pivotallyconnected with the said crushing lever 22.

To prevent side-slip or lateral or endwise movement of the cam oreccentric 16 and the bearing roller 24, the one relative to the other,as is liable to occur when the machine becomes a little worn, one ofthese parts is preferably provided with an annular groove and the otherwith an annular rib or tongue fitting in said groove.

In the construction shown in Figs. 1 and 2 the.

plates.

cam or eccentric 16 is provided With the groove 32 and the roller 24with the rib or tongue 33 closely fitting in said groove so as toprevent relative lateral or side movement of these parts; but thisconstruction may be reversed as shown in Fig. 9 in which the cam oreccentric 16 is provided with an annular rib or tongue 34 fitting agroove 35 formed in the roller 24, This result of preventing side-slipof these parts might be effected by providing one of the parts with endflanges overlapping the other part, as indicated in Fig. 10 in which theroller 24 is shown as being provided with the end flanges 36 overlappingthe cam or eccentric 16.

The trunnions 37, constituting the shaft of the roller 24, are journaledin box-bearings 38 which are closed at their ends, so as to exclude dustand grit, and which are provided with rods 39 threaded at their ends forthe reception of nuts 40. These bearing boxes provide wells orreceptacles for oil with which cotton waste, or similar material, placedin these boxes may be saturated, as is usual in lubricating car axleboxes.

In assembling the parts the bearing boxes may be slipped endwise ontothe shaft or trunnions of the roller 24, and the roller may then beplaced in position by slipping the bearing boxes into the open-facedapertures or mortiscs formed for their reception in. the top portion 41of the operating lever 23; the rods 39 passing through bosses 42 formedin said top portion of said lever, and against which bosses the holdingnuts 40 abut. This construction therefore contributes to ease inassembling or removing the parts, as well as elficiency of lubrication.

Having thus described our invention, we claim and desire to secure byLetters Patent:

1. In a crusher, an operating lever having a pair of recesses. a pair ofdust-proof box bearings having closed ends and mounted in said recesses,means for removably holding said hearings in position in said recesses,and a roller journaled in said bearings.

2. A crusher frame consisting of relatively thin side a head block orfront cross beam. and a rear cross beam overhanging said side plateslaterally and having flanges arranged within said side plates and firmlyattached thereto so as to brace said side plates, combined with adriving shaft, the bearings of which are supported by said rear crossbeam whereby said relatively thin side plates are relieved from thedirect strain of the driving shaft, and a vibrating crushing jawoperated from said driving shaft.

3. In a crusher. the combination with a frame comprising relatively thinside plates, a front crossbeam, and a rear cross-beam separate from butsecured to said side plates and supported thereby above the bottomthereof. 1

of a driving shaft, bearings for said driving shaft supported by saidrear cross beam whereby said relatively thin side plates are relievedfrom the direct strain of the driving shaft, crushing jaws between saidside plates, and operating means for said crushing jaws operativelyconnected with said driving shaft.

4, In a crusher, the combination with a frame comprising relatively thinside plates, a head block or front cross beam, and a rear cross beamseparate from but secured to said side plates and overhanging said sideplates laterally, of a driving shaft the bearings of which are supportedby said rear cross beam whereby said relatively thin side plates arerelieved from the direct strain of the driving shaft, a cam or eccentriccarried by said driving shaft, stationary and movable crushing members,and means for operating said movable crushing member from said cam oreccentric.

5. In a crushing machine, the combination with a frame comprisingrelatively thin side plates, a head block or front cross beam, and arear cross beam separate from but secured to said sideplates andsupported thereby above the bottoms thereof, of a driving; shaft thebearings of which are supported by said rear cross beam wvhcreby saidrelatively thin side plates are relieved from the direct strain of thedriving shaft, a cam or eccentric carried by said shaft, a stationarycrushing plate, a crushing lever pivoted at its lower part to said sideplates, a crushing plate mounted on said lever, an operating leverhaving a roller bearing against said cam or eccentric, a thrust plate ortogggle interposed between said operating lever and the upper part ofthe said crushing lever, and a spring and suitable connections forretracting said crushing lever and for holding said bearing roller incontact with said cam or eccentric.

(i. A crusher frame consisting of relatively-thin sideplates, ahead-block or front cross-beam rigidly attached to said side-plates, anda rear cross-beam having flanges arranged within said side plates andfirmly bolted thereto so as to brace said side plates, combined with adriving shaft the bearings of which are supported by said rearcross-beam whereby said relatively thin side plates are relieved fromthe direct strain of the driving shaft, and a vibrating crushing jawoperated from said driving shaft.

7. In a crushing machine, the combination with a frame comprising sideplates, a front cross-beam, and a rear cross-beam. of a driving shaft, acam carried by said shaft, a stationary crushing plate, a crushing leverpivoted at its lower part to said side plates, a crushing plate mountedon said lever, an operating lover, a roller carried by said lever andbearing against said cam. a thrust plate. interposed between saidoperating lever and said crushing lever. and a spring and suitableconnections for retracting said crushing lever and for holding saidroller in contact with said cam.

In testimony whereof we affix our signatures, in presence of twowitnesses.

THOMAS LEGGIGT'I. S'lUIt'LEVANlF. THOMAS JOSEPH S'lUlt'lEVAN'l.Witnesses:

W. ll. ELLIS, H. G. ALLBliIGl-IT,

